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OHV rebuild.


RCranger99

New Member
Joined
Mar 8, 2013
Messages
3
Transmission
Automatic
Hello,

As it stands my current 1996 ranger is starting to get a little burnt out. I have owned this truck for the last 30,000km. I don't think the previous owners did much for it. I believe the head is cracked over cylinder #3 as I have a misfire that wont go away. Also the truck was overheated and now consume a reasonably large amount of oil. This engine has still some life left in it but it is on its way out.

I am sure a good portion of people can relate to this but I really like my ranger. Sure there are a lot of times I wished I had a full size but there is something about rangers that keeps my coming back to them. This is my third one.

So what I was thinking was I would get a junk yard engine. Tear it down and send it out to get hot tanked cleaned and a .020 bore on the block. Having had both OHV engines and SOHC engines I do prefer the OHv sure it doesn't rev as fast but it seems to put down the torque very nicely.

Now here is where the fun comes in. The OHV has a 9:1 compression ratio and the SOHC has a 9.7:1 compression ratio. It is my understanding that the pistons are interchangeable between the two engines. Now what I am not sure of is will putting the SOHC flat top pistons give me a 9.7:1 compression ratio?

Since I will be replacing the heads I figured I would take them to the guys who will be cleaning up the block. They have pretty good prices on porting and valve jobs. Get them to build up a very nice flowing set of heads.

Also as far as camshafts go I have not really decided to go with the 422 or 410. Most likely the 410 due to it making power a little lower than the 422 in the RPM's.

All other parts will come from a generic rebuild kit. I would like to replace as much as I can. Now I know this seems like it will be expensive however I was quoted $3200.00 for a re-manufactured 4.0 OHV. So I feel much better about going this way.

Now I know there is always the option to put in a v8. I really don't want to go that way I am not building an anything more than a new engine to put in my ranger that in bolt in and never deal with again other than basic maintenance. I don't want to spend a bunch of time fabricating things for something I have never done before. I want to build an engine while my current one is in the truck and be able to switch the old one out for the rebuilt one in a weekend.

I feel that I have a good plan laid out for a nice OHV. The only thing I am not sure about is the pistons. While I would really like the increase of power from extra compression I haven't seen a lot of info about people going that way. Any thoughts for that part of the equation?
 
This is only my opinion for compression-stick to stock nowadays. Today's fuel sucks. I've built pop-up piston 327 Chevy 11.5:1, Pontiac 400 11:1, Ford 35W 11:1- I am old. And nothing is reliable as stock compression and you will not notice a .7 bump in compression at your rear wheels when it comes to HP and torque. But I think head changes will cause the increase in compression for you the best.
 

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